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your best option (if I understand your question correctly) is to build your site at a smaller width (800px is safest) and create a background that fills the extra space on larger screens. While many users do have larger screens, many users don't. Some people with larger screens don't maximize their browser windows.

Scrolling up and down is easy. scrolling side to side is very annoying. A smaller site with background decoration will look best across all screen sizes.

Empty spaces are fill with light background is this common way? and is it usable?

If we're both talking about simple, unused space (e.g., if a website is centered and 900px wide and the user's screen is 1400px, we have 250px of empty space on either side), then yes, it's quite common. And very useable, to the point where most people don't even really notice it.

Originally Posted by jelumalai

One important thing is this is for Business application used by daily basis

Do you mean that this website is designed for particular users - employees of a company, for example - and not intended for the general public?

If you use any sort of analytics or tracking services (google?) then check the screen resolution information to see the proportion of users using 1024 x 768 or less - you can then make informed decisions about the most appropriate site widths for your users.